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tragedy_jj

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[求助] 做拉曼的免疫检测,抗体应该怎么标上去?!

RT,要做SERS,标记银颗粒的时候,往胶体银加入4巯基苯甲酸反应过夜,然后加抗体孵育1h,封闭离心测SERS信号比较强,但是层析之后基本没有信号了,这是为什么呢?!我猜测是4MBA不够量,大部分抗体标记银都没有吸附上4MBA,而大部分吸附上4MBA的的银都没有吸附上抗体,但是如果加大4MBA的量,Ag颗粒会发生聚集,该如何解决呢?!我是不是应该先用银吸附上4MBA,然后用EDC、戊二醛等把抗体跟4MBA偶联呢?!我第一次做这方面,小白一个,请各位解答一下谢谢!
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